Commutator-cylinder



W. H. KEMPTON.

COMMUTATOR CYLINDER. APPLICATION FILED MAY 28. 1919.

1,401,708. Patented Dec. 27, 1921.

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g a BY ATTORNEY Commutator-Cylinders, of

v In PatentNo. 1,284,524, dated Nov. 12,1918

UNITED STATES PATENT OFFICE.

WILLARD H. KEMPTON, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTING- COMPANY, A CORPORATION OF PENNSYIr nonsn ELECTRIC & mmumcrun'me van-m.

Application filed May 28,

To all whom it may concern:

Be it known that I, VVILLARD HQKEMPTON, a citizen of the United States, and a resident of Wilkinsburg, .in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in which the following is a specificationfi My invention relates to commutator 'cylinders for dynamo-electric machines and to other structures in which the assembled conducting and non-conducting portions are held in position by reinforcedmolded rings of non-conducting material.

The'primary object of my present invention resides in the provision of a commutathat a damaged commutator cylinder. may be readily'repaired.

{and issued to the Westinghouse Electric & Mfg. Company, isdisclosed a molded commutator cylinder in which the alternately arranged conducting and insulating sections ducting sections in place.

are artially embedded in a body of molded insulating material and in which cord reinforcing rings of molded insulatingmate- .rial are embedded in the molded'body and seated in grooves formed by notching the ends of the conducting and insulating sections. -This provides a very simple and strong commutator-cylinder construction as the reinforced rings firmly hold the con- Such a-com'mutator cylinder, however, can be repaired only with considerable difiiculty and expense. I Q

. One of the objects of my present invention is to construct a commutator cylinder possessing many of the advantages of the molded commutator cylinder descrlbed 1n the? above-referred-to patent but of such' ing which shows a diametral, sectional view-- of a commutator cylinder constructed in ac-' cordance with my invention, alternate con- COMMUTATOR-CYLINDER.

. Specification of Letters latc'nt. Patented Dec. 27, 1921.

1919. Serial No. 300,431.

ducting and insulating segments 1 and 2,

respectively, are arranged in annular relation, to form a hollow cylinder, with their inner edges engaging against the outer oerlphery of an insulating tube 3. r This tube may be of any suitable material but may preferably comprise superimposed wrapped layers of fibrous" sheet material impregnated with a heat-hardened binder,

such as a phenolic condensation product.

The ends of the conducting-and insulatmg segments 1 and.v 2 may preferably be notchedso that, when they are assembled,

they may provide annular, ring-receiving grooves 4 to seat reinforced retaining rings 5 of insulating material. These rings '5 may be of the character disclosed in the abovereferred=to patent, being formed of a suit-- able filler mpregnated with a hardened binder as, for example,-a phenolic condensation product, so as to insure good me-. chanical strength with high insulating properties. Preferably the rings or, at least, those portions thereof which seat in the grooves 4 are reinforced by strands of cord extending around and around the rings as indicated in the drawing.

The tube 3 may be fitted snugly about a hollow cylindrical sleeve or hub ,6, preferably of metal, by means of which the commutator cylinder may be attached to a shaft (not shown).

The ends of this sleeve or hub may preferably project beyond 'the body of the commutator cylinder and are adapted to receive end clamping plates? whlch are screwed upon the ends of the sleeve to engage snugly. against the ends of the tube 3 and the outer exiposed faces of the reinforcing rings. Pre erably, the outer faces of the reinforcing rings may be recessed to provide annular seats 8 to re ceive the outer portions of the clamping plates to insure proper centralization of the various assembled parts.

When constructing a commutatorcylinder in accordance with my resent invention, I prefer, after assembling the alternate conducting and insulating segments about the rings 3 and sleeve 6, to coat the grooves formed by them with a varnish of suitable character, such as a bakelite or shellac varnish, to provide a seat for the reinforcing rings If this is done, the assembled commutator cylinder may be heated suflicientl to insure proper seating of the parts an curing of the varnish. In some instances, in place of the varnish, piecesof loose texturedypaper impregnated with the varnish may be disposed in the grooves to provide seats forthe rings, the varnish of these pieces of paper being cured in the same manner after the commutator cylinder is completely assembled.

. Obviously, a commutator cylinder constructed in accordance with my invention will possess many of the advantages inher ent in molded commutator cylinders of the character disclosed in the patent referred to. At the same time, in case the commutator cylinder becomes injured, because of shorting of the conducting members, from excessi've sparking or the like, it may be readily dis-assembled, so that the injured parts may be replaced by new parts after which the commutator cylinder may be quickly reassembled and made ready for use.

Since many changes in the'details of construction may be made without departing from the spirit of my invention, no limitations are to be imposed upon it other than those indicated in the claims.

I claim as my invention:

'L'A commutator cylinder comprising a metallic sleeve, a tube of insulating material surrounding the sleeve, alternate conducting and 'insulating segments provided with notches arranged in annular relation about the tube, windings. of cord impregnated with a hardened binder disposed in the notches and means detachably securing the segments with relation to the sleeve while maintaining tion to the sleeve while maintaining the conducting segments insulated therefrom.

In testimony whereof, I have hereunto subscribed my name thisQQnd day'of May 1919.

WILLARD H. KEMPTON. 

